xcode - Accessing an Image with specific resolution in the Asset Catalog programmatically with Swift -

-

i have image set called "smileyface" contains 1x, 2x , 3x image sizes. want copy pasteboard specific size image set. how reference 1x, 2x or 3x programmatically in code below?

let image = uiimage(named: "smileyface" ) let image2 = uiimagepngrepresentation( image ) uipasteboard.generalpasteboard().setdata(image2, forpasteboardtype: "public.png")

this code copies 1x. want copy 2x image.

please not send me apple documentation not seem reference this.

update: figured out ztan's post below.

let xscale = uitraitcollection(displayscale: 3.0)   //could 1.0, 2.0 or 3.0 let image = uiimage(named: "smileyface" )?.imageasset.imagewithtraitcollection(xscale) uipasteboard.generalpasteboard().image = image; println("width: \(image!.size.width).") println("trait: \(image?.traitcollection).")

you can use imageasset.registerimage() method:

  let scale1x = uitraitcollection(displayscale: 1.0)   let scale2x = uitraitcollection(displayscale: 2.0)   let scale3x = uitraitcollection(displayscale: 3.0)    let image = uiimage(named: "img.png")!   image.imageasset.registerimage(uiimage(named: "img_2x.png")!, withtraitcollection: scale2x)   image.imageasset.registerimage(uiimage(named: "img_3x.png")!, withtraitcollection: scale3x)

you can register 2x image scales.

however, dont think idea access image specific resolution. idea if 1x, 2x , 3x image set let system decide image should loaded. if want to, might change name of 1x, 2x , 3x images smileyface-small, smileyface-regular, smileyface-large.

update: func imagewithtraitcollection(traitcollection: uitraitcollection) -> uiimage can reference image specific scale:

  let image1 = image.imageasset.imagewithtraitcollection(uitraitcollection(traitsfromcollections: [scale1x]))   let image2 = image.imageasset.imagewithtraitcollection(uitraitcollection(traitsfromcollections: [scale2x]))   let image3 = image.imageasset.imagewithtraitcollection(uitraitcollection(traitsfromcollections: [scale3x]))

Comments

Post a Comment

Popular posts from this blog

c++ - No viable overloaded operator for references a map -

-
i trying use map can make tag names reference number. when try , use it, in code error (6 in total every time reference map): src/main.cpp:25:45: error: no viable overloaded operator[] type 'std::map<std::string, std::string>' const char* idcs = node.child_value(tagmap[3]); this code: #include "pugi/pugixml.hpp" #include <iostream> #include <string> #include <map> int main() { pugi::xml_document doca, docb; std::map<std::string, pugi::xml_node> mapa, mapb; std::map<std::string, std::string> tagmap {{"1", "data"}, {"2", "entry"}, {"3", "id"}, {"4", "content"}}; if (!doca.load_file("a.xml") || !docb.load_file("b.xml")) { std::cout << "can't find input files"; return 1; } (auto& node: doca.child(tagmap[1]).children(tagmap[2])) { co
Read more

java - Custom OutputStreamAppender not run: LOGBACK: No context given for <MYAPPENDER> -

-
i wish write custom appender on basis of outputstreamappender . wrote following class package tests; import java.io.ioexception; import java.io.outputstream; import ch.qos.logback.core.outputstreamappender; public class myappender<e> extends outputstreamappender<e> { public myappender() { system.out.println("myappender created"); setoutputstream(new outputstream() { @override public void write(int b) throws ioexception { throw new unsupportedoperationexception(); } }); } } then wrote following runner: package tests; import org.slf4j.loggerfactory; import ch.qos.logback.classic.logger; public class runner { private static final logger log = (logger) loggerfactory.getlogger(runner.class); public static void main(string[] args) { //log.addappender(new myappender<iloggingevent>()); log.info("hello world"); } } finall
Read more

java - Cannot secure connection using TLS -

-
i'm trying establish secure socket connection between java client applet (built jdk 1.7.0_75-b13) , vc++ server application. as test vehicle, used vc++ client/server sample found in msdn forums, modified use schannel , able establish socket using cipher suite tls_rsa_with_aes_128_cbc_sha. works of tls 1.0/1.1/1.2. when try opening socket java applet same server application, connection rejected server reporting following: tls 1.0 acceptsecuritycontext failed: 0x80090327 tls 1.1 acceptsecuritycontext failed: 0x80090331 tls 1.2 acceptsecuritycontext failed: 0x80090331 this java code used create socket: debugprint("setting secure connection"); sslsocketfactory sslsocketfactory = (sslsocketfactory) sslsocketfactory.getdefault(); sslsocket sslsocket = (sslsocket) sslsocketfactory.createsocket("127.0.0.1", socketnumber); debugprint("starting handshake"); sslsocket.settcpnodelay(true); sslsocket.setsolinger(false, 0); sslsocket.s
Read more